GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VIII (NEW) EXAMINATION — WINTER 2020
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Subject Code: 2180903
Subject Name: Power System Planning and Design
Time: 02:00 PM TO 04:00 PM
Date: 25/01/2021
Total Marks: 56
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Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) Why transmission should be carried out at high voltages? --- Content provided by FirstRanker.com --- (b) What do you mean by compensation with refer to transmission line? Explain shunt compensation(c) Discuss the following factors to be taken into consideration in the mechanical design of a transmission line. (1) Loading on the conductors (2) Span, sag and tension. (3) Clearance from the ground. | MARKS 03 04 07 |
| Q.2 | (a) Explain the terms with reference to reliability assessment (1) MTTF (2) MTTR (3) MTBF --- Content provided by FirstRanker.com --- (b) Differentiate between equipment earthing and system grounding.(c) What is meant by stringing of line conductors? What is a stringing chart? How it is prepared and what is its use? | 03 04 07 |
| Q.3 | (a) What do you understand by tuned power lines? (b) Define critical disruptive voltage and visual critical voltage --- Content provided by FirstRanker.com --- (c) A two conductor street main AB, 500 meters in length is fed from both the ends at 250 V. Loads of 50 A, 60 A, 40 A and 30 A are tapped at distances of 100 m, 250 m, 350 m and 400 m from the end A respectively. If the cross/section of the conductors is 1 em’and specific resistance-of the material of the conductors is 1.7p Q-cm, determine the‘'minimum consumer voltage. | 03 04 07 |
| Q.4 | (a) What are sag templates? (b) Discuss the various methods of voltage regulation used in distribution system (c) A single phase a.c. distributor 500 m long has a total loop impedance of (0.02 +j0.04) Q and is fed from one end at 250V. It is loaded as under:
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| Q.5 | (a) Explain (1) BIL (2) protective margin --- Content provided by FirstRanker.com --- (b) Discuss why earth wire is required for overhead transmission lines. Where is it located on the transmission line towers?(c) Explain any one method of measuring soil resistivity and earthing resistance | 03 04 07 |
| Q.6 | (a) Define dry flash over voltage, wet flashover voltage and impulse voltage (b) Write a note on location of lightning arrester --- Content provided by FirstRanker.com --- (c) Explain main considerations in planning and designing generating stations in power systems with reference to the following: (1) Role of different types of power plants in large power systems. (2) Choice of generator unit constants. | 03 04 07 |
| Q.7 | (a) Write a note on selection of location for power plants (b) Write a note on transmission system planning. (c) Discuss in detail the steps in planning and designing electrical distribution schemes | 03 --- Content provided by FirstRanker.com --- 0407 |
| Q.8 | (a) Explain radio and television interference. (b) What are the different methods of load forecasting? (c) Explain the financial aspects of power system improvement scheme. | 03 04 --- Content provided by FirstRanker.com --- 07 |
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